You must have exported some or all of your existing customers, vendors, inventory items, and general ledger accounts using data export functionality within Dynamics GP. When selecting the data to export the following types can be selected:
Account
Customer
Item
Vendor
When the export file is created you will have a zip file that contains several txt files that will be determined by what you selected during the export data process. There will also be additional txt files that are generated that contain supporting information needed for setup within your new Business Central company.
The Dynamics GP Data Migration extension automatically maps the exported data so that your data is quickly available to you in your new Business Central company.
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